Trominoes with Bridges

thingiverse

If you connect three squares at their sides, at their corners or by bridges skipping a square gap, you can get 15 different one-sided pieces. With these pieces it's possibe to construct a lot of figures, and it's rather easy to get a solution by hand within 10 to 30 minutes. The bridges are A-shaped with a slope of 60 degrees to print the pieces without support and to place other squares easily on the gap below the bridges.